Colonization history of the Japanese water shrewChimarrogale platycephala, in the Japanese Islands |
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Authors: | Masahiro A Iwasa Hisashi Abe |
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Institution: | 1. Laboratory of Wildlife Science, Department of Animal Science and Resources, College of Bioresource Sciences, Nihon University, 252-8510, Fujisawa, Kanagawa, Japan 2. Katsuraoka 26-17, 047-0264, Otaru, Hokkaido, Japan
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Abstract: | To evaluate the intraspecific evolutionary history and local differentiation of the Japanese water shrewChimarrogale platycephala (Temminck, 1842), we an a lyzed the mitochondrial cytochromeb (Cytb) sequence divergence for samples from 55 localities in the Japanese is lands of Honshu and Kyushu. According to phylogenetic
trees based on theCytb data, there were fourCytb haplotype lineages, which showed rough affinities with geographic areas, namely, Eastern/Central Honshu, the Kinki District
of Western Honshu, the Chugoku District of Western Honshu, and Kyushu. However, in the alpine areas of the boundary between
the Kinki and Chugoku Districts, complicated distribution patterns of theCytb haplotypes were revealed. Considering the present data and geological history in the Quaternary, we hypothesized the following
evolutionary scenario. First, differ entiation and division into four primary ancestral geographic colonies of the shrews
occurred in hypothetical refugia in the mid — late Pleistocene. Subsequently, rapid expansion occurred and caused the complicated
distribution patterns of theCytb haplotypes in the boundary areas owing to the complex topography during the late stage of the Quaternary. |
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